Team
Dr. Christina C. Roggatz
Group leader
I am fascinated by how environmental factors dynamically alter the chemical communication and interactions between species. Whether it’s chemical analysis, computational chemistry, or biological growth and behavioral tests - methodologically, my team and I utilize everything that provides us with comprehensive answers across different spatial and temporal scales. As a trained (marine) biologist with a Ph.D. in chemistry, I prefer to work in an interdisciplinary and cross-disciplinary manner.
Projects: DIALMOD, CONCENTRATE, Biofilm-MRT
E-Mail: croggatz@uni-bremen.de
Telephone: 0421/218 56659
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Lena Kathrin Keller
Technical Assistant
I support the working group in my role as a technical assistant. My responsibilities include culturing benthic diatoms, preparing samples for 16S sequencing, and ensuring laboratory hygiene and safety.
Project: DIALMOD
E-Mail: klena@uni-bremen.de
Telephone: 0421/ 218 63084
Anja Ruhl
PhD Student
As part of the DIALMOD project, I am investigating the interactions between benthic diatoms and the bacteria associated with them in biofilms. My focus is on characterizing the biofilms and identifying the substances exchanged during these interactions. A central aspect of this research is how the effects of these substances are influenced by fluctuating environmental factors such as pH.
Project: DIALMOD
E-Mail: aruhl@uni-bremen.de
Telephone: 0421/218 56659
Janina Barkowsky
PhD Student
I began my doctoral thesis in mid-February 2026. I am particularly interested in the fluctuating environmental conditions in benthic diatom biofilms and how these conditions affect sugar-degrading enzymes.
Project: CONCENTRATE
E-Mail: jbarkows@uni-bremen.de
Henrike Welpinghus
Coordinator for Outreach and Participation
As the Outreach and Participation Coordinator for TRR 420 CONCENTRATE, I develop programs that make research on the marine carbon cycle accessible and engaging. I also serve as the point of contact for communication-related inquiries regarding the Collaborative Research Center.
Project: CONCENTRATE
E-Mail: hwelpinghus@marum.de
Telephone: 0421 218-65688
Jonas Fischer
Post-Doc
As a soil ecotoxicologist, I study the interactions between anthropogenic pollutants (e.g., pesticides) and the soil matrix, and how these interactions can negatively affect soil organisms, including through the formation of free radicals or mixture-toxic effects.
Project: ROSCAR
E-Mail: j.fischer@uni-bremen.de
Telephone: 0421/218-56653
Sara Sophie Coordes
PhD Student
As part of the ROSCAR project, I have been investigating the effects of abiotic and biotic environmental parameters on copper-induced ROS formation in soil since September 2025.
I conduct soil chemistry research and use ecotoxicological test systems to study the growth, reproduction, and behavior of soil organisms.
Project: ROSCAR
E-Mail: scoordes@uni-bremen.de
Telephone: 0421/ 218 56659